| 2MORO | Montréal | Aerospace |
| A-1 Test de Pyrite/Vermiculite/Amiante/Environnemental/ | Longueuil | Analytical & Testing Laboratories, Asbestos Testing & Consultants |
| A.E. PETSCHE CANADA, INC. | Kirkland | Aerospace |
| AAA Canada | Montréal | Aerospace, Aircraft Maintenance, Service & Storage |
| Abbott Laboratories Limited | Montréal | Tout Entreprises et services |
| ABIPA CANADA INC. | Laval | Aerospace |
| AD OPT | Montréal | Aerospace |
| ADACEL INC. | Brossard | Aerospace |
| ADVANTECH INC. | Dorval | Aerospace |
| AERONAV NAVIGATION INTERNATIONAL | Pointe-Claire | Aerospace |
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| Aeroneuf Instruments Ltée | Dorval | Aerospace, Aircraft Parts, Engines & Avionics |
| Aerospace Concepts of Canada Inc | Montréal | Aviation Consultants & Services |
| Aerospace Development Corp | Montréal | Aircraft & Private Jet Charter |
| Aerospace Group | Montréal | Aircraft Dealers |
| AEROSPACE WELDING | Blainville | Aerospace |
| Aerospace Welding Inc | Blainville | Tout Entreprises et services, Aviation Consultants & Services |
| AEROSPHERE | Pointe-Claire | Aerospace |
| Aerosystems International Inc. | Montréal | Aerospace, Tout Entreprises et services |
| AGAT Laboratoires | Montréal | Analytical & Testing Laboratories |
| AGAT Laboratories | Montréal | Analytical & Testing Laboratories |
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| Agat Laboratories | Montréal | Analytical & Testing Laboratories |
| Air Data Inc | Mont-Royal | Aerospace, Aircraft Parts, Engines & Avionics, Tout Entreprises et services |
| AIR RESEARCH TECHNOLOGY INC. | Montréal | Aerospace |
| Air Saphir - Qualité d'air | Laval | Analytical & Testing Laboratories |
| Air-Ins Inc | Varennes | Analytical & Testing Laboratories |
| AIRCRAFT EQUIPMENT & SUPPORT SERVICES | Dorval | Aerospace |
| Airmax Environnement | Montréal | Analytical & Testing Laboratories |
| AIRNAV ELECTRONIC | Dorval | Aerospace |
| Alain Delorme Urbaniste | Brossard | Analytical & Testing Laboratories |
| Algorithme Pharma Inc | Mont-Royal | Analytical & Testing Laboratories |
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| Align Aerospace | Boucherville | Aviation Consultants & Services |
| Alphacasting Inc. | Montréal | Aerospace, Tout Entreprises et services |
| ALSIM | Montréal | Aerospace |
| ALTA PRĂCISION INC. | Anjou | Aerospace |
| AltaSciences Inc | Laval | Analytical & Testing Laboratories |
| ALTITUDE AEROSPACE | Montréal | Aerospace |
| Altitude Aerospace Inc | Montréal | Aircraft Maintenance, Service & Storage |
| Altitude Aerospace Inc | Montréal | Aircraft Maintenance, Service & Storage |
| ALUBOX (DIVISION DE JE LORTIE COMPAGNIE LTĂE) | MontrĂ©al | Aerospace |
| Amec Earth & Environmental | Des Sources | Asbestos Testing & Consultants |
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| AMESYS | Montréal | Aerospace |
| Amiante National Asbestos | Montréal | Asbestos Testing & Consultants |
| AMPHENOL AIR LB NORTH AMERICA INC. | Saint-Hubert | Aerospace |
| AMRIKART R.C. INC. | Boucherville | Aerospace |
| AP&C RevĂȘtements et Poudres AvancĂ©es | MontrĂ©al | Aerospace |
| AP&C RevĂȘtements et Poudres AvancĂ©es | MontrĂ©al | Aerospace |
| AQUACOUPE TECHNOLOGY INC. | Mirabel | Aerospace |
| Aqualabo | Montréal | Analytical & Testing Laboratories |
| ARTEC TECHNOLOGIES | Montréal | Aerospace |
| ASSYSTEM PRODUCT ENGINEERING CANADA | Montréal | Aerospace |
